Thanks for helping out!
I bought a "plug and play" cabinet that included a Pk2600 Mini carbon filter 160M3, with exit fan, a Winflex 125 VKO in line axial fan (whatever the hell that all means...), 185m3/hour. The air intake is passive: three holes down in the cabinet with protection caps. There was, indeed, no fan included. So, you're saying that I might not need one? My first round ever went great with the current static fan, but it's just too large. I do need to cool, though. So a clip fan will suffice. Unfortunately, most clip fans use a usb connection. Do you know of a clip fan with plug?